Before lumber companies began selling OSB, the standard choice for sheathing a roof with a 24-inch rafter spacing was 1/2-inch CDX plywood - the letters CDX indicate that it is construction-grade material intended for exterior applications.

Most ceiling tiles are made from mineral fiber, but other materials are available, such as fiberglass. Mineral fiber tiles typically have a high Noise Reduction Coefficient (NRC), which means they are good at absorbing sound within a space to prevent echo or loud environments.

According to leading consumer and trade magazines, the US Department of Energy, the heating and cooling contractor you choose does make a difference. The same equipment can be installed in the same home by two different contractors, and there can be a difference in comfort, equipment efficiency, and overall life.